Go into a store and look at the games available that should point you in the right direction.
We have been through the Xbox and PS2 consoles in out house and my son and I both perfer the xbox. Theres some great deals around for new (or almost new xboxes).
The game cube has some real fun games too, but it can sometimes be difficult to get anything for it :(
h yeah if you can be bothered the XBox is very easily modified to turn it into a media centre, play import DVDs, install games to the internal HD etc, without having to open the console
If you like playing against other humans then the XBox is also the best option.
Rob...